This is the registration card confirming that Ed Kemper’s father, Edmund Emil Kemper Jr. (II), was discharged from the army after World War II in 1945.

Edmund Kemper II enlisted in the Army on June 21, 1939. He served in World War II during his enlistment. After the war he tested atomic bombs in the Pacific Proving Grounds before returning to California, where he found work as an electrician. 

Sources: Ancestry / Find a Grave